linux-kernel - Re: WARNING in usbhid_raw_request/usb_submit

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Date:   Fri, 3 Jan 2020 12:01:44 -0500 (EST)
From:   Alan Stern <stern@...land.harvard.edu>
To:     andreyknvl@...gle.com,
        syzbot <syzbot+10e5f68920f13587ab12@...kaller.appspotmail.com>
cc:     gregkh@...uxfoundation.org, <gustavo@...eddedor.com>,
        <ingrassia@...genesys.com>,
        Kernel development list <linux-kernel@...r.kernel.org>,
        USB list <linux-usb@...r.kernel.org>,
        <syzkaller-bugs@...glegroups.com>
Subject: Re: WARNING in usbhid_raw_request/usb_submit_urb (2)

On Fri, 3 Jan 2020, syzbot wrote:

> Hello,
> 
> syzbot has tested the proposed patch and the reproducer did not trigger  
> crash:
> 
> Reported-and-tested-by:  
> syzbot+10e5f68920f13587ab12@...kaller.appspotmail.com
> 
> Tested on:
> 
> commit:         ecdf2214 usb: gadget: add raw-gadget interface
> git tree:       https://github.com/google/kasan.git
> kernel config:  https://syzkaller.appspot.com/x/.config?x=b06a019075333661
> dashboard link: https://syzkaller.appspot.com/bug?extid=10e5f68920f13587ab12
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> patch:          https://syzkaller.appspot.com/x/patch.diff?x=177f06e1e00000
> 
> Note: testing is done by a robot and is best-effort only.

Andrey:

Clearly something strange is going on here.  First, the patch should 
not have changed the behavior; all it did was add some log messages.  
Second, I don't see how the warning could have been triggered at all -- 
it seems to be complaining that 2 != 2.

Does the reproducer really work?

Alan Stern